<!DOCTYPE html>
<html>
<head>
    <style>
        body { 
            margin: 0;
            padding: 10px 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: bold;
            background: #f0f0f0;
        }
    </style>
</head>
<body>
    首页
</body>
</html>